Connor
Your UH-60M may be an upgrade/mod from earlier production.
This search engine might help for Joe's website:
http://users.rcn.com/jeremy.k/serialSearch.html
It is sometimes painfully slow, and sometimes down for maintenance, but yields good results.
May also be a fresh frame or mod that is not listed yet...
e.g. UH-60M 27000 (04-27000) is ex 84-23953 rebuilt.
other bits:
906 UH-60A / 311 UH-60L conversions planned.
New s/n: New c/n:
02-26976 / 02-26978 M-1 / M-3
04-26998 / 04-27001 ?
05-20001, 05-20002 ?
05-27047 ?
John
Had to re-edit this post several times, that's what I get for posting at 6AM with NO coffee...