thompsonjoe,
Nice old mold! UMC (Union Metallic Cartridge) Company was located in New Haven CT. Became REM-UMC in 1911 which would suggest that your mold was made before then.
The bullet is for the .32 Colt Long Central Fire. It is a heeled bullet weighing about 90 grs. I have some U.M.C. .32 L C F headstamped cartridges that I reload for my 1892 Marlin rifle.
w30wcf