Stanley Gibbons Queen Victoria 2020 Specialised Catalog Value Question

I'm wondering how this is treated. I've been looking at some items that have separate values listed for items with special marks, I.e., certain colored cancels, etc. How is the value treated for these items?

For instance here is an example -

If I have a BS4 on page 61 and its value listed as £80
AND
Is has a MX cancellation sa Black (p. 155) listed as £55, off-cover,

How is that value treated for BS4sa ? 80, 55 or £ 135

The 2020 Vol 1, Part 1, lists BS4 on page 161.
The £ 80 'used' price is for a very fine stamp, off cover, neatly cancelled by an ordinary cancellation mark that would be usual for that period, i.e, a black MX.

The listing (sa) on page 155 is for the cheapest (or non-plated) Penny Red of the 1841 type, cancelled by a black MX, e.g., plate 25.
The listing for B1 (page 155) of £ 35 is for a non-plated or cheapest-plate Penny Red of that type with an 1844-type cancellation in black (xa), see page 157.

Many Penny Red (1841-type) plates were in use when that cancellation was current. In this case, plate 62 (page 197) was a Penny Red of the 1841-type current when the 1844-type cancellation (xa) was current.

Now, BS4 was in used when the black MX was current and common. So, in this case the plated (plate 15) stamp would be for one with a black MX cancellation (sa).

BS4sa would be the price listed for BS4, i.e., £ 80.

Many many thanks! I had posted on another board and gotten not very nice replies for asking. In reading the preface of the catalog, I did not see how this was treated.

Your explanation is very helpful - appreciate the time.

SG - still has not responded. They needed 2 more weeks!!

I seem to remember there is some remark about it being the cheapest somewhere in the preceding 160 pages. But it is not a very obvious remark.




It is sad people cannot get themselves to help a fellow philatelist.
There, of course, are people hoping to have inherited a fortune who cannot be trusted to perform the simplest google search. But those people, normally, stand out like a sore thumb.