MST-13 Timers: How many types?

In a recent post (MST-13 Timers Delivery Timeline), I have already told you that:

MEBO used the following terms to describe the various production stages of these timers: prototypes, pre-series and production-series.

  1. The first five MST-13 timers have a circuit board with “solder mask” on one side only and were built into boxes.
  2. The second five MST-13 timers have a circuit board with “solder mask” on both sides  and were built without boxes.
  3. The last ten MST-13 timers have a circuit board with “solder mask” on both sides and were built into boxes.

I must now tell you about another feature of the MST-13 Timers: 2 vs. 4 positions switch.

Some timers could be set between 1 and 99 Minutes/Hours.

DM141-P315

Some timers could be set between 1 and 9999 Minutes/Hours.

DM141-P312

Lumpert stated that all (5 or 6) 4 digits timers were pre-series.

“It is correct that only five or six timers with 4 positions switch were made and they were pre-series ones. The pre-series timers had protective lacquer only on one side.”

This is a rather simple post. Yet, its consequences are not without merit. FBI Richard Marquise’s beloved principle of “attention to details” may take a serious hit… Stay tuned!

Reference

Lumpert Statements

 

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