Paul Alcuri Backstamp And Codes?

I have a bunch of stamps with Paul Alcuri backstamps. They are often also accompanied by some inscrutable codes like on this stamp.

I don't suppose anyone is able to decipher those? They might just be cataloging information, but I figured it couldn't hurt to ask.

5c Jefferson?
It's the Michel catalogue number.

I would agree with stamperix.

Although NOT an answer to your specific question, a (seemingly) random series of letters are often a code representing the cost of the stamp. Hopefully that code would be marked on the sales page that the stamp is on, but I've seen plenty of codes on stamps to know that some people will write directly on the stamp. I know of 2 codes, and there are many others. The ones that I know are C-O-L-U-M-B-I-A-N-S and M-A-K-E-P-R-O-F-I-T. They represent the numbers 0-1-2-3-4-5-6-7-8-9 OR 1-2-3-4-5-6-7-8-9-0. A code will only work if it is exactly 10 letters long and if there is only one of each letter. I suppose one could use a code with 11 (or more) letters in the phrase/word, but delete the duplicate letters (so that it ends up with 10 letters, total).

I always keep an eye out for these 'random' letters on a stamp, or sales page, so I can try to figure out what the cost is on the prospective purchase. If the code is on the STAMP, it MAY not be the cost to the dealer/collector that currently owns the stamp.

I hope I didn't give away the farm with this post!! (Actually, I do.)

Happy stamping.

ETA: I enjoy trying to figure out a dealer's code. If I have an idea of what he SHOULD (or, could) have paid for the stamp, I can often figure out what the first letter stands for. If I have access to his stock, I can often figure out a bunch of his letters and fill in the blanks (and also figure out if his code starts with '0' or '1'. Also, if the code is (thankfully!) on a sales page, I KNOW it is this dealer's cost and not an earlier owner's. Also, SOMETIMES the initial letter corresponds to '0', so there might be a 3-letter code for a stamp costing $75, say.

Thanks! I see 19II x v/b - how much of that is part of the catalog number?

19IIxb is the catalogue number, I guess the other thing is vf for very fine? How does the front look - vf?

More like Fine. Thanks for the clarification. I suspect those other marks were made by someone else.