Timeline of the 19 different Caterpillar tracked models produced by SpecCast:

1. SCT 482 - Challenger MT875E track tractor Expo launch, 12/11/13
2. SCT 483 - Challenger MT875E track tractor Collectors edition, 12/11/13
3. SCT 503 - Challenger MT865E track, 08/21/14
4. CUST 1397 - Agco Farm Show Edition 2015 Challenger MT865E, 07/08/15
5. CUST 1404 - Farm Progress Challenger MT865E, 07/09/15
6. SCT 528 - 1/64 Challenger MT875E track tractor (imprint), 07/29/15
7. SCT 538 - 1/64 Challenger Xedition track tractor (imprint), 09/14/15
8. SCT 549 - 1/64 Challenger MT875E track tractor, 11/04/15
​9. CUST 1449 - NFMS Challenger MT875E X Coll. Edition 1:64, 01/26/16
10. CUST 1457 - Challenger MT855E Toy Truck and Construction unit, 03/15/16
11. CUST 1494 - Agco Farm Show Edition 1/64th Challenger Xedition track tractor, 06/23/16
12. CUST 1503 - Farm Progress Challenger MT 875E, 07/18/16
13. CUST 1566 - Farm Progress Challenger MT875E X Edition, 06/06/17
14. SCT 653 - Challenger MT865E track camo, 10/05/17
15. SCT 654 - Challenger MT865E track Desert sand, 10/05/17
16. SCT649 - Challenger MT865E track, 10/05/17
17. SCT650 - Challenger MT865E track Pink, 10/05/17
18. SCT651 - Challenger MT865E track US flag, 10/05/17
19. SCT652 - Challenger MT865E track Canadian flag, 10/05/17