1975 Bally BOW AND ARROW SOLID STATE: This machine is > ( No. 17 of olnly 17 ever made )
A quantity of 22 electro-mechanical games were modified as a test of Solid State design.
Ian MacDonald, the son of Bally engineer Doug MacDonald who was involved in these conversions, told us his father remembered building 17 units, although he thought it possible that other people there could have built or converted additional machines using spare parts. The boards for the machine were designed by Doug. His initials, the letters d and b, are etched into them in a back to back fashion similar to "db", and may be hard to see.
This information is from Jay Stafford of the IPDB.
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