The chips are custom inlay ASM chips on the HHR mold with 312 spots. The odd number of chips are from production run 'extras', which were typically included with orders at no extra charge. Your set was most likely an order for 400 chips, which allowed for four different color designs (200, 100, 80, 20) plus the extra chips that were included for free.
Similar chips are now produced by CPC, although some colors may not match up exactly. They should still have the ASM inlay artwork on file, but may require the original order customer's approval to reproduce it.