I was given a couple of old (1983 built) MO-1's which I've been rehabbing to current best practices.
I've searched the net for history and found very little.
This what I've found: 36 or 37 units built. Delivered to USN Dec 1, 1924. Maybe begun in 1921.
Used only by the USN. Carrier-launched and arrested landing. Also float-equipped.
What's missing: End date of use. War record (not much chance that I can imagine). Any surviving units? I doubt it.
I seems unlikely that any units remained in service into the 1930's. The Navy has a practice of getting rid of the old stuff when new comes to them.
The model shown is not mine, just one I photographed at a contest.
Note the 1969 Carrier model plan. This must be a very early Class I model. Back in the day of no official profile and no sliders. The publication date of 1969 implies that it probably dated back to circa 1966.