Comparison of some cheap control knobs with Hosco Knobs
The Hosco Knob has a much thicker central boss, cleaner lettering and weighs around 3.5gms compared to 2.8gms for the cheap version.
The skinny boss can mean it is easy to split it when fitting or removing the knob.
The Lettering is crisper on the Hosco model and while it is hard to see the colouring of the letters the cheaper on is a very yellowy gols while the Hosco one is a deep gold colour.
Here you can see the quality difference between the cheap copy and the Hosco Knob. The central boss on the Hosco knob is much more robust and the loulding is altogether cleaner.