I think those are Lee dies they're in an RCBS die box. The label on the box says lube die. That die was used to lube cases prior to resizing. The dies should have a manufacturers name on them somewhere.
Those are not RCBS die #87552. A google search will show you what the die actually looks like. RCBS doesn’t make push through dies. They look like Lee dies. They definitely have Lee lock rings on them.
On closer examination and comparison I would agree that they a Lees. They are not marked as Lee but the nuts and overall die is very similar. The are it little longer and only have the size marked on them. Probably very early lee production. Thanks for your input.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |