This LAH Inf Sgt board was purchased from the same vet at a hotel buy. There is a lot not to like about this at first examination. The back side is black, instead of field gray. The tongue is cut-off and the cypher appears to be painted with silver paint. The paint job looks so farby that no self-respecting repro artist would claim credit for it.
However-the prongs are of the same style as on the officer board. As to the cypher itself, not all the details on the 'H' are cut-out-but this is a common trait of this maker. If you look closely at what lies underneath the silver paint, there is a quality, detailed cypher in there. The fact that relatively fewer white metal LAH cyphers seem to be around, suggests that fewer of those were made than the gold-colored officer types. Hence, the silver ones may have been difficult to obtain, even back in the day. This would've contributed to causing period modifications like this.