Help identifying the year of this Gibson A-OO Mandolin

[jtsc]

I recently came into possession of this Gibson A-OO mandolin. I believe it is a mid 1930's instrument and the only information I see to help date it is the stamp on the inside of the f-hole which reads "1320-9". The 1320 is stamped and the -9 is hand written in faded ink (pen?). The pickguard, Gibson logo, basic ebony bridge (non-adjustable) and the tailpiece lead me to believe it's definitely post late 20's and before WWII. I am unable to see any other numbers/letters anywhere (and have a heck of a hard time seeing the end-block on the inside of the instrument). Any input is greatly appreciated.

Ignore the arm-rest. I added that recently as I tend to sweat a lot when playing on hot summer days.

thx,
JTSC

[MikeEdgerton]

The Factory Order Number 1320 shows as an A-00 from 1934 in Spann's Guide to Gibson 1902-1941. According the the Gruhn book this would have been it's second year of production, the first year with that logo, F holes, and an elevated pickguard.

[Capt. E]

Yours has a flat back, correct? It looks to be in very nice condition...enjoy it. I have had a well worn 1937 A-00 for a while now and enjoy it very much especially for old-time and blues. Great all around instrument with very good volume and tone: the only possible negative is it has a short scale without an elevated fretboard.

Here's mine: