Trailing applied by machine is perfectly spaced and even, the same applies to a master glassmaker but there would be measurable variations. In this case the bands spacing is irregular.
Now despite saying that the technical skill is less than a master, it does not make it a poor piece. There is a school that says never mind the technique it is the effect that counts. Monart and a lot of Scottish glass, sort of, falls into that category. As do many studio workers whose aim is art rather than craft.
If you look at striped Monart, it is always done with a dip mould, I do not recall ever seeing a trailed piece... apart from the odd rare applied rim. They marvered the stripe colour on to the parison and then blew into the dip mould (like an inside cog) this stretched the glass into the valleys pushing the stripe colour back. The piece is then twisted. For crossed line pieces a second colour is then marvered in and the dip mould process repeated. This time twisting the other way. Finally covered in clear glass for blowing to final size.
You piece not having a colour added before using the dip-mould shows how this technique affects underlying layers, due to the transmitted pressure. The trailed spiral would have been tightened as the piece was twisted following the dip mould stage.
Counting the 'teeth' can be a useful aid towards identifying as few glassmakers would have a large selection of dip-moulds. Big ,heavy and expensive to buy. I think Monart used 3 or 4, check some of Kevin's posts in paperweights for counts of Monart and Vasart dip moulds.