dscd5244.jpg

The ID tag on the engine handler assembly.

It reads

Ground Support Equipment
Part Name
Handler Assy, Engine
Part No.		Contract No.
G 4064 MD2		NAS8-19
Date of Mfg.		Stock No.	Model No.
[blank]		[blank]	[blank]
Serial No.	Spec No.	Weight	Insp.
J 1007	[blank]	[blank]	[Inspection stamp: "ANR 939"]
Rocketdyne
A Division of North American Aviation, Inc.
U.S.

"MD" is commonly used with Rocketdyne hardware to indicate the implementation of an engineering change request, so this would appear to be the third version of the handler design.