Cornell Publicaitons has a book on the company that may have sn data.
Try Cornell Publications for sn book on this company
No sn data I know of.
Cornell Publications might have sn data.
Unlikely that detailed sn data has been published.
the Iver Johnson website has some sn info IIRC
No such maker. However, if it is Harrington and Richardson, you will need to see if Cornell Publications still sells a book with H&R sn information.
Model can't be determined from just the sn. 10-100 USD or so
Cornell Publications might have a book with sn info. 10-125 USD depending on specifics
No published sn data on them that I know of.
what letter or letters are in front of serial number
No published sn data.