Quote:
I imagine they date from the late 1800s or early 1900s and were made in England.
That's correct. Victorian and a bit after. I thought I had one or two of the M&co ones but can't immediately locate them. I have seen a few. With these whistles it is often hard to tell who made them, it was not uncommon for instrumetns, eg concertinas, at the time to be rebranded and labelled with a trader's name rather than a maker's name. There are a fair few whistles from the period that look identical but are labelled with different badges (or none at all).
It's not easy to find out much about these, I imagine they were not considered significant enough to document, often they may have been sidelines and part of a wider musical instrument manufacture. Some of the larger musical instrument traders can be traced though (Wallis in England or Mathieu in France, for example)