Calculating tool based on:
fraziercapital.com Chapter-9-MachineryEquipment-1.pdf
The calculation must focus on the the Age-Life principle, which is to be found on pages 209 to 212.
It could be a spreadsheet template or online tool.
This is used for the valuation of assets that are special, made to order and are never offered for sale. For that reason, a comparable open market value is not available.
The article does not include an inflation factor. That should also be applied as a percentage increase (or decrease) from the date of manufacture to the latest available date.
The article can be searched and downloaded using a search engine or from my upload.
Placeholder bids are not to be considered.
A realistic time frame is much appreciated.