Most, but not all Harmony instruments have a date stamp, in the format 'F62' (fall 1962) or 'S70' (summer 1970). It is usually stamped more or less in the middle of the back. If there is no visible date stamp, probably the best guess comes from comparing it with similar examples that do have a date. It could be anywhere from '50s to early '70s.

I would be pretty sure that the 'B' in your model number is in fact a blurry 'H', for Harmony. All my harmony instruments (several guitars and mandolins) have model/serial number stamp in the format 'XXXXHXXXX'. I know that the numerals after the H indicate the model (like 1210 or 962 or 8081).

I have seen it said here that Harmonys don't have 'serial' numbers as such. Thanks Jeff, After I posted this I did some searching and read the same thing. I believe you're right about the 'B' being a 'H'. I have not been able to locate a date stamp.

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By the way, one of the posts I found in my search was a response by Mike Edgerton that said the 'F' and 'S' in the date stands for First half of the year and Second half of the year. He got that info from someone who worked for Harmony. Anyway, as I said, I can't locate a date stamp. The number I posted is inside the bass F hole. On the upper bout bass side there is a 'HC' stamp that is right up against where the back and side is glued together. Any idea what this stands for? Post a picture of the back of the headstock as well as the front of the entire mandolin.

Some of these can be dated from the tuners (at least to a decade or so). The date stamp is at times hard to see, try shining a flashlight in though the f holes and looking at different angles. I think they used disappearing ink on some of them (or so it seems). The old convention was F=Fall, S-Summer.

Then someone that worked for Harmony actually was interviewed and the F=First Half S=Second Half came to light. It made more sense. Either way pictures are the best way. The model number 5732H410 could shed some light but there are no real records available. Generally it's thought that one side of the H is the model and the other side might be a serialized number in that batch. Unfortunately that doesn't get you anything unless there are factory records and there are none that have surfaced as of yet.

Matlab Portable 2012 Full Action. Thanks for your input Mike. I'm assuming you were talking about photos of my mandolin since I'm the OP. It doesn't have strings on it and I removed the finger rest to clean it.

The finger rest is black plastic and the bridge is the standard rosewood. I'll probably replace it with a new bridge. The tailpiece cover was missing so I don't know if it was the cloud or the long bean shaped version. I have searched the entire inside of the body with no sign of a date stamp. Checked from all angles.

The only thing I found other than the number I showed in the original post is a 'HC' printed on the inside of the body on the bass side of the upper bout right on the very edge. Here's the photos. I'm confused now too Larry!