[Amps] Solenoid polarity on DC reed relays

[Bill VanAlstyne W5WVO]

I'm constructing a vacuum/reed relay QSK T-R system in my converted SB-220 6m amplifier. I'm using two Kilovac HC-1 vac relays for the input and output RF switches and one small RGS-6396 DPDT (SPDT/RF, SPDT/aux) reed relay purchased from MGS (http://www.mgs4u.com/RF-Microwave/RFrelays_misc.htm) to switch the bias voltage between operating bias (TX) and cut-off bias (RX). (Not using the RF part of the reed relay.)

According to everything I've read, coil polarity is important on (most?) DC reed relays. Using three 9V batteries in series as a power source just for test purposes, the little relay appears to operate reliably using either voltage polarity across the coil -- but I haven't hooked it up to a scope yet to see if there is a difference in speed. 

There is no +/- indication anywhere on the relay body -- and according to Allen Bond of MGS, polarity on this particular relay probably doesn't matter. He said that in his experience, all polarity-sensitive reed relays are clearly marked with +/-. However, there is a schematic diagram of the relay printed on the body, and in this diagram, one terminal of the solenoid coil is represented by an unfilled circle, while the other terminal is represented by a filled circle. I'm wondering whether this might be indicative of coil polarity.

Does anyone on this list know if this is true for this particular MGS-supplied relay?

Bill W5WVO