These charming small size fonts are often mistaken for just that – a mini church font but they are in fact so called fire wells. It is hard to imagine their actual function in that the two illustrated measure a diminutive 8cm tall and the full size versions I have seen around 20cm.
They have been previously described as examples of Doulton advertising for themselves, but the Well Fire and Foundry Co was a company of yesteryear as you can see from this advert found on the Internet. These items for the company date to the 1920’s and 1930’s.
The light green version in a matt glaze bears no indication of its use but simply the usual Doulton impressed mark, suggesting Doulton sold them too as fancies, or ashtrays, or indeed mini well fires!