Unique House Of Commons Postage Free Letter

I have lots of these type of stamp free Government letters as many collectors have...The interesting thing about this cover it was send by the ""Honorable Robert Stanbury"" with a cancel from ""House of Commons""..Others I have have just a regular cancel on the cover....

This one by the looks of it had the cover initialed by Robert Stanbury...Unique

Robert

I don't think this is unique but I hope it is as I have several that have both a House of Commons cancel (although from a much earlier time period) and initialed by the sender on the lower left side of the envelope.
The practice of initialing the free franked envelopes was also used by the militia during WWI at least.
The ones I have are complete and with contents and the signatures of the sender are a match to the initials on the envelopes.

Cheers, Bill

I believe these are not cancels but metered postage ?

Peter

Here's a couple of mine sent to Mr. Simpson from his MP, MP's last name is Seasmith.
The last picture compares the signature to the initials on the envelope.
Would these be metered postage?

Cheers, Bill

For the first one, how about ...
"The free frank was applied by a meter machine and received no subsequent postmark after it entered the mails."

For the other two, The first went through an International Postal Supply Co canceling machine with a modified killer section to denote a free frank... + various handstamps.

The word "unique" certainly does not apply.

I apologize to wert I don't want to steal your thread but I'd like to understand.
I thought this hand stamp from the House of Commons was from the House of Commons mail office and added first and it in itself would be sufficient to travel through the mail.
If so why were the Ottawa cancels even added?
These two items were sent less then three weeks apart to and from the same address but the earlier dated one (second picture) seems more like a hand cancel then a metered one.
Why this difference?

Cheers, Bill