"Quartern" Pewter Measure

I'm hoping someone knowledgeable about English measures and pewter marks might be able to shed some light on an interesting item I picked up recently. As you'll see in the attached photos, it is marked "quartern" and also "1/4 PT", which I understand to be the same thing, i.e. 1/4 of a pint in volume. I believe this is also the same as a "gill". It appears to have a Crown VR verification mark, for Queen Victoria, above a three-digit number. This number is very difficult to make out but appears to me to be 150. On the same side, there is what looks to be a number 4. Lower down, a small brass plate stamped "1/4 PT" has been soldered to the side of the measure, something I've not seen before. On the other side, there is a mark that appears to be a crown, with letters I can't quite make out above and below. Is this a maker's touch mark, or possibly and earlier verification mark? I would be very grateful for any thoughts!

 

looks like a tavern mug..

 

funny how pub stuff, looks like pub stuff....

 

Thanks to everyone who has replied!

Now, since the original posting, I've discovered a couple of things....

First, the number of the verification mark isn't 150, but is actually 159. This is the verification mark for Kinross County, in Scotland, used from 1826 to 1879.



Second, there is a quality mark in the inside bottom of the measure, a numeral "2" over a crown, over a letter "X". This number / crown / letter mark was, apparently, used by pewterer James Yates of Birmingham.



Unfortunately, I still haven't been able to identify the mystery mark on the rim. To my eye, it looks like two letters (a "D", and perhaps a "C"?) over a crown, over another letter ("W"?). Here's a better photo of it:



The brass plate also remains a bit of a mystery. As mentioned, I've not seen this before, and haven't been able to find another example of a measure with such an applied plate. If anyone is aware of another example, please let me know!

 

There's a bloke goes to my lcal car boot sale has a habit of adding those brass plates to make things look fancier.