A few interesting examples and baselines which can be used when making an assessment of quality. You will need to click each photo to see the enlarged verion and associated comments.
Poor to low quality
This piece speaks for itself. Particularly evident is fitting which uses the lowest quality of materials.
Average to above average
This reproduction piece was quality controlled to some extent and it shows through in smaller details. I would not however place this piece at top quality but rather slightly above average.
This piece is definately of a higher level of craftsmenship, particularly evident in the materials and workmanship.