1938 is a trickier date than its neighbours, in keeping with the principle of
the "second date". People tended to hoard the first issue of a new
monarch or effigy, but not the second. It is useful to compare the
following date pairs with this in mind:
1887/1888
1902/1903
1911/1912
1937/1938
1953/1954
There is a unique example of a 1952 currency half crown, that turned up
in a coin collector’s change in 1967. This is a marvellous story, and
I cannot tell it any better than one of its owners can:
An interesting point to note is the change in the design of the shield
from the previous reign. The new halfcrown features a heraldic
shield hanging by a ring and pin — George V's halfcrowns displayed a
"tilting shield", with a slot at top left, for a jousting lance.
George V vs George VI Halfcrown designs
This new design was intended to portray a less martial, more peaceful
impression. The reign did not, unfortunately, turn out quite as
peacefully as the designer had hoped.