Kanji stamp help needed

[mmg]

Hello and thanks for reading my post,



those are stamps from guitar manufacturer, in cavities of pickups.
In order to track Maya Musical Instrument CO and Chushin gakki
history and guitar models I need to know what these kanji mean.

Both red and black one. If I "translated" it correctly part of it says "Yamada",
which is probably surname of guitar inspector.

Any help is precious to me.

Thank you.

[KyleGoetz]

The red one says "3 [something]." I can't make it out because the ink has worn away.

The black stamp says:
INSPECTOR
Nov. 12, 1978 ("54" means "54th year of the Showa Emperor," which is 1978)
Yamada

[siokan]

三条?
Is it producer's first name?

[Nyororin]

最初の投稿者：KyleGoetz

Nov. 12, 1978 ("54" means "54th year of the Showa Emperor," which is 1978)

Wait...
1978?
Umm, wouldn`t it be 1979?

[mmg]

I am astounded by speed and will to help me out!
Thank you so much, all of you.

I am in your debt.
Peace.

[KyleGoetz]

最初の投稿者：Nyororin

Wait...
1978?
Umm, wouldn`t it be 1979?

You're right. 1979.

I don't know this stuff by heart, so I used this chart: hanga gallery . . . torii gallery: Japanese Date Conversion

1. I'm a little disappointed I can't get the awesome "search engine" at wolframalpha.com to convert between Japanese and Gregorian calendars.

2. I misread the chart anyway. 1979 is correct, Nyororin.

[mmg]

I'll try to make better photograph of the red stamp.
Could it be that it says "third class" 三等?

[masaegu]

最初の投稿者：mmg

I'll try to make better photograph of the red stamp.
Could it be that it says "third class" 三等?

I highly doubt it as red ink is almost exclusively used for name stamps.

[mmg]

You're probably right.
There is no way this high quality guitar is "third class" anyway.
Thank you for you time.

[masaegu]

No chart needed if you can remember the magic number 25.　

昭和〇〇年　+　25 = 19〇〇年