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Looks like the switch is a DPDT so whatever the crystals are it will only add another 40 or 23 channels depending on the radio. I saw something similar for the Pearce Simpson SSB radios to let them get up in the 40 channel radio range.
That is a channel kit for a Cobra 29GTL, 29LTD and Uniden PC76. The PLL in these radios is not modifiable so the adder crystal (15.350 Mhz) signal coming from the tripler circuit must be changed. In that particular channel board, the 14.910 Mhz crystal will give you the lower 40 channels, and the 15.810 Mhz one will give you the upper 40.