The right side bumper would be where the yellow circle with a 4 bridge class would be located, but the traces of yellow on your bumper doesn't resemble a circular shape.
If there are more white numbers (ex: 2502 or 2503) that would be the ordinance code. M37 with winch is 2503 and without winch is 2502.
One thing I noticed while looking at many old photos and surviving original trucks to determine markings for my M37, is there was a lot of variety in markings, marking location, and paint patterns over the years, across the many different units and in different geographic regions of the country.
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1953 M37 CDN
1953 M38A1 CDN
1967 M38A1 CDN2
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