40 or 420

[BLS]

I ran across a 5 roller crawler in the brush. It has been sitting for a while. It is complete and it has a holt blade & a cargo winch. The data tag is missing from the crawler.

How do I tell if it is a 40C or a 420C?

What is the value in the current condition?

How do I tell if it is above SN 100000?

Thanks

[Lavoy]

420 has a water pump, 40 does not. There are lots of other ways, but that is the fastest.
420 above 100,000 has 8 bolts bolting the sideframes to the track clutch housings.
Lavoy