Lanna Dahbs, in their scabbards.
Smiths migration 's, indeed, interesting. In previous meeting ago, we learned that there are steel tools (and weapons) making around Ayuthaya city center. During the 2nd sack of Ayuthaya, many smiths were ported to Burmese 's city. And some were killed. In the early Rattanakosin, during king Rama 2nd era, there were immigration of Lao 's smiths (gold, silver and steel). They settled down in the Ayuthaya area (which was an old city by then

). In the early of 20th cent., their steel products were dominant in the market as Aranyik 's product. In fact, Aranyik 's the name of a market/hub village where these people sold their products, the manufactoring place is PaiNong village

. Some were sold in Bangkok many were exported as far as Lao and Vietnam (some of us found them during search for Lao or Vietnam 's local sword). And, by now, Aranyik 's Lao sword design turned to be recognized as Dahb Thai.
Similar thing happened in Burman side, Ayuthaya (Yodia, in Burmese term) smiths made long hilt Dha which, today, can be found around Mandalay.
Lanna and southern Lanna smiths has a different story. As far as I know, Chiang Mai do not has its own sword making community (sounds odd, I need to do more research in this are). Many Dha, Dahb were imported from nearby cities, used to be Tai Shan cities (on Burman side) and LamPang (~100 miles south of ChiangMai). Not long ago, just after WWII, LamPang guilds got a huge order of Dahb Thai from Bangkok, which actually is Aranyik (Lao) style. Today, they still making both traditional Lanna and Aranyik 's Dahb Thai sword. There 's another sword making community in Utaradit, near an infamouse Nam-Pi iron ore deposite. But I think they got "infected" by Aranyik style by now.
Indeed, there were some smiths in the rural area which were not captured during the Ayuthaya 's 2nd sack. But they do not make weapons as a primary job. And, since king Rama 3rd, there were immigration of the Chinese. They come with chinese technique and go into the business. Scattered Siamese smiths gave up their business and ,so far, I could not find a single Siamese sword maker in my area.