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285642 would be a Rola speaker made in the 42 week of 19x6 (you have to figure out which decade using other information).For additional speaker manufacturer codes, see Ted Weber's listing at Weber Speakers.To help determine the manufacturing date of Hammond organs and Leslie speakers.Use this form if you would like to submit your Hammond Organ for inclusion in these tables.Don't get too hung up on searching for temporal coordinates to the exclusion of the unit's real purpose as a musical instrument.Some of the component parts of Hammonds and Leslies have EIA codes printed on them.
Some specific examples are cited that can be used to provide assistance in identifying the production date of similar components. Tung-Sol 6550 tubes have the following format: XXXYYWW, where XXX is the EIA manufacturer code, YY is the last two digits of the year and WW is the number of the week in that year.There are a number of visual cues: anything with a foil CBS ID tag is post 1966, anything with a metal tag is prior to 1966.The typewritten silver foil tags appeared in the mid to late 70's.Just to get started, 21H's are 1951 to 1958, 22H's are 1958 to 1963, 122/142/147/145's are late 1963 and later.
Any other single speed model (45/47/51) is prior to late 1963.However, by examining those components as a group one can determine that the instrument was produced no earlier than the latest date indicated by its component parts.