On the 515/519 the Back skin is really the Frame that hold it all together. The Front skin [pump handle side, Other side in 1st picture] is considered to be front, was removable to service interior.

Jack Sim author of several books [2 on pumps] & a member here has the largest [that I know of] collection of literature, although I didn't see the 515-E listed;
http://petrolianacollectibles.com/wayne%20515.htm
He MIGHT have something on a later Model 615 using the same pumping guts.

Last edited by Dick Bennett; Thu Oct 25 2012 08:12 PM.
Reproduction/Fantasy Cans
http://i124.photobucket.com/albums/p2/oldegaspump/AllCansMASTERTHUMBNAIL_zps4bfdbbc7.jpg
Rnd Can Re-lids