The last HP part number system was the 8-digit number. Your relay is Hewlett Packard 6090-2093.
qService on eBay is listing 40 of your relays for $44.50 with $7 shipping.
Lot 40PCS HP-Agilent 6090-2093 Reed Relay-NOS
Look. The Chinese are buying U.S. obsolete parts and are cornering the market on them.
Aviation and Military surplus companies in the U.S. charge premium prices for their stashes of obsolete parts.
YOU can waste your time searching for one relay if you want to, but if I were you, I'd buy the 40 relays on eBay and consider myself lucky.
You see how many relays are on your board. Buy the lot, save a few for the next ones that fail on your board, and resell the remainder you
don't want to get your money back.
If you find one relay by itself, it's gonna cost you $40 by itself.
Good luck.