Sailboats built by American Mariner Industries by year on Sailboatdata.com

Founded by Arthur S. Henry. All models were designed by Henry, who held a patent for their unique recessed cabin sole (into the keel) that provided increased interior headroom. The sales literature referred to this feature as the "stabilizer keel".
As with so many other pleasure boat builders, AMI went bankrupt during the economic downturn at the beginning of the 1980's.
Some of the 'American' brand boats seem very similar to ones offered by Reinell Co. at this time or even before. So it's likely that they came from the same molds. (The Reinell AMI connection is not well understood by us).
Reinell also seems to have gone out of business at about this same time.

HID prefix for American Mariner models was AMX (since reassigned).
By far, the best source of information for anything to do with this builder can be found at the site shown here.

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BY THIS BUILDER:
(Dates indicate when a boat was first built by ANY Builder)

NAME/TYPE

LOA

First Built

English / Metric

AMERICAN 30

29.92' / 9.12m

1977

AMERICAN 23

23.00' / 7.01m