*AN/PSR-1 & 1A Seismic Intrusion Photo Comparison*
By: TexasOK
26 November 2016

Here is a quick way to identify seismic intrusion units on ebay that are not listed properly.

All photos show the Version 1 on the left and version 1A on the right.

Front case view... Notice the difference in the speaker perforations.

Notice wire bails used for removal of unit from the steel case and the pointer knobs are at the 2 o'clock position. This is only seen on the version 1 model. Pointer knobs are in the 12 o'clock position in the version 1A models.

Back View Version 1 has no hinged battery panel.

This photo shows the version 1 removed from its steel case

Side by side back view

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