The catalogue lists two types of 500 Tögrög, P#58 (ND (1993) and 1997) and P#65A (2000) which we have followed. However, looking closely at the three notes in question (see images here and here), the 1997 and 2000 are identical types (dated and with a windowed thread) whilst the undated (1993) is slightly distinct in having no date and a normal thread. Can I suggest we group all three into a single entry? Alternatively, if we feel the addition of a date and windowed thread is sufficient, can we move the 1997 date to the same entry as the 2000?