Serial number identification 61-12491

Jacob Brothers from 1921 according to the link shown:


https://www.mypianofriends.com/i-have-a-jacob-brothers-piano-model-number-57866-but-i-cant-find-any-infor...-107545.html

Quoting:

I have a Jacob Brothers piano model number 57866 but I can't find any infor... by Guest 5 days ago
9
I have a Jacob Brothers piano model number 57866 but I can't find any infor... I have a Jacob Brothers piano model number 57866 but I can't find any information on it? Anyone know anything regarding this model?
Posted on Questions & Answers
Answer
4 days ago C. Anthony
Guru
Blogs: 48
Forum: 16,526
Votes: 420 What type of information do you want? you have the piano in front of you!
specifically what do you want to know?
the SN shows 1921 date.
Have you tuned it this year? If the piano will not hold tune to A=440hz, the value would be 0. However, I would think it would hold 440...but I may not.
Call your local piano technician to check it fully.
CAPReply

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(1905)!! Please Read On How To Tell How Old Your Piano Is !! I Learned This From Grandma !!
Piano serial numbers usually have five to seven digits, but may have fewer or more, depending on the manufacturer and age of your piano. Serial numbers may also include a letter as well.
Here are the TOP FIVE places to locate the serial number of your spinet, console, or upright piano:
Serial number locations are found:
1) On the piano's cast iron plate. After lifting up the lid, look along the top front area of the plate. The serial number may be to the right or the left, or in the middle.

2) Under the opened lid on the ledge, stamped on a little plaque, to the right or to the left.

3) Stamped on the back of the piano; near the top of the wood frame.

4) Printed on one of the hammers, found on either end of the piano (newer or imported pianos).

5) Printed on one the keys - behind the nameboard, inside the piano (newer or imported pianos)

If this is an identification question, we're gona need some jpgs: at least one inside the sound hole (if there is a sound hole), and look on the headstock for a serial number. Any information will help! I'd like to think you'd mention it if it were a 12 string as opposed to a six string, but the serial number will tell us how old it is. New, a 6 string goes from 3-5 hundred bucks.

You can look up on internet I have but can't remember site look up Asian strat or squires or japan strat or fender strat identification or Korean strat indentfication just keep at it you will find tons of info

Cannot find info reflecting a B prefix on this site:
Gibson Electric Guitar anbd Bass Serial Number Date Code Information
Check following link for pics and description by model year.
Vintage Guitars Info Gibson flattop vintage guitar collecting

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

You haven't asked a question. If you're looking for the year on a Fender Starcaster, you're missing a letter or two from the front of the serial number. I suspect you're looking for info about a different guitar than a Starcaster.

You don't specify brand or model of the instrument you're asking about, but generally on an electric guitar the serial number will be on the front of the headstock, the back of the headstock, the heel, or the neck mounting plate, as it apppears your's is.

check out this site http://www.ibanezrules.com/fakes.htm

Your guitar was made at the
Kalamazoo Plant, USA
approximately in: 1967

Check front of headstock, rear of headstock. Neckplate on the back of guitar. If not, remove neck and check the heel and neck "pocket."