The doubling doesn't looks as strong as DDO-004/WDDO-004. It looks closer to DDO-005/WDDO-010. Can you see or get pics of any die markers?
Wexler has kept track of a lot of useful die markers for the 72 DDOs, hopefully his site can help you out: http://www.doubleddie.com/384301.html
Wexler has kept track of a lot of useful die markers for the 72 DDOs, hopefully his site can help you out: http://www.doubleddie.com/384301.html






























