Help ID transport disc

[timberwolves]

Good afternoon, can anyone help me identify my disc. I purchased this years ago and never knew the brand/model number of it. One of the bearings went along with a 2 3/8” spool as well as a few cutters. I was able to chase down the bearing and cutters. Having a tough time with the smaller spool. The markings on each of the different size spools are as follows, all have the letter G & DK along with DK-50, DK-51 & DK-53 on them. Wondering if anyone is familiar with these markings and maybe they can help me identify this unit. Thank you John.