Many thanks to SWLing Post reader, Dan Robinson, who writes:
Almost never seen on Ebay, the Drake RR3, otherwise known as the R4245, which is also essentially a Drake R7/A inside a marine style case.
This one has some condition issues, so anyone considering it should ask some thorough questions…
Wow–I don’t think I’ve ever seen the Drake RR3/R4245 before. It would certainly be a unique Drake piece to have in the shack.
As Dan mentions, the seller does not offer returns, so you would want to thoroughly research the condition prior to bidding.