A way of FG-150 from 1968 to 1972 has several change.

Change in SPEC

• A head YAMAHA logo changed from a square logo to a chief body logo. (Red label early stage)
• The end pin was changed to plastic from a wooden one.
• The peg was changed to the pressure type from the fleshy type.
• The shape of Pickguard was changed.
• The character of “YAMAHA GUITAR” inside the red label was changed to a chief body logo from a square logo.
• The rod cover of the temple bell type was changed to the triangle type.
• The head YAMAHA logo was changed to a tuning fork mark. (The red label middle term-latter period)
• 3 millimeters of positional mark of a finger plate was changed to a dot from 5 millimeter dot.
• The shape of the pick guard became big from 1972.

The above change of specifications is sometimes intermingled by time.

As an irregular individual.
5 millimeters of positional mark of a finger plate checked the individual as a dot by a tuning fork logo and the triangle type rod cover, too.

Sample01: FG-150 S/No,803XXX

The Spec of FG-150 S/No,803XXX is ,,,

• YAMAHA chief body logo
• A peg is the fleshy type of the early stage.
• The temple bell type rod cover
• 5 millimeter dot positional mark
• The end pin is plastic./span>
• A pick railroad overpass is the red label period (It’s rather small.) type.
• A “YAMAHA GUITAR” logo in the red label is a chief body logo.

The inner carved seal is unconfirmed, but when infering from a serial number, this individual seems an individual in 1968.

Sample02 : FG-150 S/No,899XXX 5th Nov. 1968

The Spec of FG-150 S/No,899XXX is ,,,

• YAMAHA chief body logo (I happen to disappear almost all, but, 、、)
• The triangle type rod cover
• The latter period thin type peg
• 5 millimeter dot positional mark/li>
• An end pin is lost. A general-purpose end pin was put.
• A pick guard is the red label period (It’s rather small.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.

There is inner carved seal with 43.11.5, so it seems a manufactured individual on November 5, 1968.

Sample03 : FG-150 S/No,979XXX

The Spec of FG-150 S/No,979XXX is ,,,

• A heading, that, tuning fork mark logo
• The triangle type rod cover
• The latter period thin type peg
• 5 millimeter dot positional mark
• Plastic end pin
• A pick guard is the red label period (It’s rather small.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.

The inner carved seal couldn’t be confirmed.
Making in around 1969?

Sample04 : FG-150 S/No,1052XXX 8th Sep. 1969

The Spec of FG-150 S/No,1052XXX is ,,,

• A heading, that, tuning fork mark logo
• The triangle type rod cover
• The latter period thin type peg
• 5 millimeter dot positional mark
• Plastic end pin
• A pick guard is the red label period (It’s rather small.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.

There is inner carved seal with 44.9.8, so making seems the individual who worked on September 8, 1969.

Sample05 : FG-150 S/No,1081XXX 17th Oct. 1969

The Spec of FG-150 S/No,1081XXX is ,,,

• A heading, that, tuning fork mark logo
• The triangle type rod cover
• The latter period thin type peg
• 3 millimeter dot positional mark
• Plastic end pin
• A pick guard is the red label period (It’s rather small.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.

The inner carved seal is 44.10.17 (The fiscal year part is blurred.), so making work seems to have been performed on October 17, 1969.

Sample06 : FG-150 S/No,1157XXX 10th Feb. 1970

The Spec of FG-150 S/No,1157XXX is ,,,

• A heading, that, tuning fork mark logo
• The triangle type rod cover
• The latter period thin type peg
• 3 millimeter dot positional mark
• Plastic end pin
• A pick guard is the red label period (It’s rather small.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.

There is inner carved seal with 45.2.10, so making seems the individual who worked on February 10, 1970.

Sample07 : FG-150 S/No,1314XXX 22th Jul. 1970

The Spec of FG-150 S/No,1314XXX is ,,,

• A heading, that, tuning fork mark logo
• The triangle type rod cover
• The latter period thin type peg
• 3 millimeter dot positional mark
• Plastic end pin
• A pick guard is the red label period (It’s rather small.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.

It’s 45.7.22, so the inner carved seal seems a manufactured individual on July 22, 1970.

Sample08 : FG-150 S/No,2021XXX Feb. 1972

The Spec of FG-150 S/No,2021XXX is ,,,

• A heading, that, tuning fork mark logo
• The triangle type rod cover
• The latter period thin type peg
• 3 millimeter dot positional mark
• Plastic end pin
• A pick guard is the red label period (It’s rather big.) type.
• YAMAHA GUITAR” logo in the red label is a chief body logo.