Both are tested and they work. Copyright 1977 American Lightning Specialties. The case on the larger one measures 6 1/4” tall and 6 1/4” wide. It’s marked S50 on the back. The smaller one measures 5 1/4” x 5 1/4”. I can’t make out the model number on the back. Knobs on the back can adjust the flash rate. Offers accepted.

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