Dating Leach St Ives standardware

In theory it should be possible to form a timeline based on the shape of the St Ives stamps....but someone needs to put it together.

The glaze loss round the rim might be a gaze fault called shivering, which happens during firing or cooling, at the time of manufacture, rather than a sign of age. This might be a fairly recent ‘second’ from the pottery.

Interesting. Is that stoneware or earthenware? Its often difficult to tell from a photo, as they used a lot of different mixtures of clays in the early days. If it is earthenware its pre 1937.

I put up a standard ware catalogue from the early 60's some while back. Halfway down this thread. Might give you some idea in terms of dimensions, and were they making it then.
https://www.20thcenturyforum.com/t9954p25-leach-pottery-st-ives?highlight=bernard+leach

Now that is a good find. You lucky person. It thought it might be early, at it has that look. How big is it? It becomes very interesting from hereon tho. Because that is a big size jug for back then. Unusually big. So who made it?
MMMMMMMMMMMM!!!!!!!

It looks like ‘shivering’ to me; where the glaze fails to stick to the clay body beneath.

The Leach pottery in the early years was notorious for firing badly. They had a lot to learn. So could it be from those early years? Entirely guesswork really. On one hand, a piece this big would surely have had a personal mark? Lot of work going on there. On the other hand, there were vague versions of 'standard ware' in the mid 20's. Could this be one?
Most Earthenware you see from St Ives is generally from the early 30's, and mainly thrown by Harry Davis. Dear old Bernard went walkabout for a couple of years then, mainly off to Dartington. The Elmhirsts money was Very attractive! So Harry Davis was mainly left in charge, and he spent a lot of time and energy in experimenting with forms of 'standard ware' Now Harry, was a very, very good thrower. His St Ives items you see from the 30's are usually very well made and of excellent form. But is this of 'excellent form'. Looks a bit rough and ready.
Its all Ifs and Buts, and guesswork. My advice is to hold on to it for a couple of years. Its the 100th anniversary of the Leach St Ives pottery in 1920. Items like this will the be considered 'genuine antiques', and of course they will assume ever greater significance.
Oh Lucky you..........!

I think fritting is where an impurity or larger than average piece of grogg pops under the glaze, pushing it off and forming what looks like an impact crater. If this was damage from use, the glaze around the top of the rim would be missing too.

Looks like a glaze and clay colour used by David Leach - eg. when he started Aylesford Pottery, which might help to date it.

https://www.20thcenturyforum.com/t12066p25-david-leach#163238

Aylesford start was 1954. That is several decades later than this piece.

There is a lot of obvious damage, so, yes, it will affect the value and reduce the number of collectors wanting it. Plus it doesn’t have a potter’s personal mark which will also reduce its value.

Value is always relative. If this could be specifically be dated as an early piece-first five years or so- then the very damage is part of the narrative. Damage was common. If its a early 30's piece, then damage is a lot more significant, as they had sorted the kiln out by then, and 'perfect' was the norm.
      Whatever.... their very rarity gives them value.How much is almost entirely down to the market at the time.
Snapshot.https://www.woolleyandwallis.co.uk/Search?q=leach earthenware

Choose your market carefully!