It takes a lot of work to correctly restore an old military receiver or transmitter, especially correctly restoring the front panel. Perhaps the most frustrating can be the Signal Corps acceptance stamps and how to recreate them so they look authentic. Well now there's a way. There's a fellow over on the G503 forum who makes repro SC acceptance stamps. His asking price is very reasonable and I bought 4 different stamps (he has more).
The trick was finding a reasonably close ink. After trying 2 or 3 different ones I settled on "Super Pigmented Acrylic Ink" from Speedball Art. It can be found at most art and craft stores. The Scarlet Red is the closest to the SC color. A little ink on a common kitchen sponge and a little practice later produced this result. I tried to make it look original so I stayed away from being to perfect.
Here's a link to his post.http://www.g503.com/forums/viewtopic.php?f=36&t=199413