Circuit Board V3818TC ( V3818-01 )with 3 button controller used for Clack WS1 / W1.25 timer clock Valves and other "brands" that use the Clack type of valve under their private label.3 button boards all come with Battery Back up now. Older versions did not ( cross reference with old PN V3108TC )
Photos reference the older and newer ( direct replacement ) design.
New design comes with new front "decal" to match the new slightly larger Screen lay out.Reference for programming = https://www.clackcorp.com/downloads/control_valve_manuals/V3115TC-04_WS1TC_1.25TC.pdf
Reference WS1 Service Manual
( page 12 shows circuit board )
Cross reference = V3818TC-01,CL3818TC-2T04BRD,V3818TC-2T04BRD