I'm not an expert with insulators nor am I one with old bottles, but I do love to find, buy and collect both, and really the best place I've found to do some re-search on insulators, and they have a great list of additional resources that link to on-line sites as well as books you can buy! You may already know of the site or use it to get your CD numbers but it is the "Glass Insulators Collectors Reference Site", - www.insulators.info! I think the even have a link to this forum! But anyway, it can be a little confusing to navigate their site when you are looking for exact information but what you're looking for would probably be on there somewhere! I use it A LOT!! Any time I'm bored or when I'm holding an insulator I need to look up for the CD # or just whatever I go there and look around!! Hope this helps some! I personally don't know anything about the one you're asking about tho, sorry!! Maybe someone else here will chime in!!
I agree with Mr. Hemingray, from the ones that I have seen they have all the signs that Brookfield produced them. I know that the 208 came out around 1914 which is a cross-top with inner skirt and made for more rugged territory, perhaps the 141 came out around the same time......the 141 seems more like a 121 with a cross-top. I don't know specifically where these were used/found but most likely was a preference type of thing, something like why some phone companies chose the 104s rather that the ever popular 102s