1950s 1956 Hydramatic Trans Flush

[Dave CLC#16900]

My guess it is CE 56-68.  Maybe this picture is better?

[Dave CLC#16900]

Still cannot see the letter in front. It cannot be a "5", unless the operator did an error. It could be a "S" as there were special transmissions for 56: CS-56-1001 thru CS-56-1100. I don't know if those transmissions were used on Eldo models.
Unit number on the transmission does not match the engine (or VIN) number.

Very glad to hear that the trans number doesn't match the engine number.  Will most likely send the parts car Eldo trans out for a rebuild to simplify life (and avoid having a car that can't be moved).