The Elusive 2519B 40 Bit Static Shift Register

I found this email rather amusing... arrived today in my inbox:

"Dear John,

You have received an offer from "Legacy Components ". 

.... snip ....

John,

This part is very old and worth more than your target now.  There is only 150 pcs in the world and the best price is $40 ea.  

*****------------------------------------------------------*****

2519B - signetics - 126 - $2 "