Dave
My comment was to prevent to prevent the unnecessary use of invasion stripes and sharks mouths...

But you do raise a good question.
As you probably know,the LH-last three numbers of the serial is the "Buzz number" a quick ID method for people to report "buzzing".
The L-16s prefix was LH (just as the F-86's was FU or the T-33s was "TR").
When the L-21 superseded the L-16 in active duty use, it took over "LH".
The L-16 took over the "LC" code made available when the older L-4s were retired.
Sadly, I'm not enough of an expert to explain
why sthese changes occurred...not being Pete Bowers or Gordon Swanborough...or my late friend Dave Menard.
My guess was the A- later stood for "Army".
Pick a period you want the a.c. to represent...if it's early in the plane's career, go with "LH".