AI says:
Hamer revamped the Chaparral in 1987, changing the headstock from the original, sharply dropping "hockey stick" style to a longer, more mildly angled 6-in-line design similar to the Californian model. [1, 2, 3]
During this 1987 revision, Hamer also split the model line into Bolt-On and Custom variants and updated the scale length from 24 3/4 to 25 1/2
But my my '90 has this 🫤
I'm thinking there was at least 3 different headstock variations
And these 2 next photos are both '87