Probably from an hp frequency counter, these were used before or instead of Nixie tubes. Each module has 4 5963 medium mu triodes 19 total, one is missing. The tubes are very dusty and the paint will likely come off when cleaned. The 5963 is essentially a special application 12au7, these haven’t “computer” marked on them. I have no way to test the modules but there are only mica capacitors so a determined tech could probably make them work for a clock project. Unfortunately there are only 5 of them. According to comments on google the tubes are not great audio tubes.