A ten-centimetre plate decides whether the machine suits you, what it costs to bring it over and whether you can plug it in.
The nameplate is that metal plate riveted to the frame that almost nobody looks at. It is usually dirty, half worn away and in the most awkward spot on the machine. And it is, by some distance, the most important document in a second-hand deal.
What the nameplate says overrides what the advert says, what the salesman says and what the manufacturer's catalogue says. The advert was written by someone who wants to sell. The nameplate was fitted by the manufacturer the day the machine came off the line.
A nameplate identifies one specific unit, not a model. Two machines of the same model and the same year can carry different voltages, different ratings and different weights depending on how they were configured at the factory. That is why looking up the model's specifications online does not help: you have to read that unit's plate.
In an international deal the nameplate is also what the carrier, the freight forwarder and the customs agent will ask for. Without it, every quote you receive is an estimate, and estimates for machinery transport almost always fall short.
With the serial number and the manufacturer you can do something that changes your negotiating position completely: call the official service department and ask about that machine. Many manufacturers will tell you the real date of manufacture, the original configuration, which country it was delivered to and sometimes whether it has a recorded service history.
It is a ten-minute call that can save you from a bad purchase. If the serial number on the plate does not match the paperwork, or the seller will not give it to you before a commitment, that is already an answer.
This is the most expensive and most avoidable failure of all. A machine built for 480 V and 60 Hz will not run in a European plant on 400 V and 50 Hz without work. Sometimes a transformer is enough; other times motors, drives or control electronics have to be changed, and then the fix costs more than the price difference that made you buy that machine.
Before closing, compare the plate against the destination installation: voltage, frequency, number of phases, power available at the panel and type of connection. If there is a mismatch, get a quote for the conversion before you negotiate the price, not after.
The weight on the plate is the weight of the machine, not of the shipment. To it you add packaging, the base frame, the transport cradle and everything that is stripped off and travels separately. And there are thresholds that change the price in one step: moving from a standard truck to an abnormal load, or needing a crane instead of a forklift, does not raise the cost a little, it multiplies it.
Photograph the whole machine as well, with something for scale beside it, and measure height, width and depth. With the plate weight and those three figures, a serious carrier gives you a quote that resembles the invoice.
The plate says when the machine was built. The advert usually says when it was installed, which can be one or two years later. Neither is a lie, but they are not the same figure and the difference is paid for.
That year also matters for compliance: in the European Union, 1995 is the line separating equipment required to carry CE marking from earlier machines, which fall under the rules on work equipment. If the plate year sits near that line, it is worth looking at carefully.
It happens more than you would think. A plate torn off during a repaint, a plate sanded away by years of aggressive cleaning, or simply lost. It does not make the machine useless, but it does change what you should pay for it and what you should demand first.
In that case look for the serial number stamped into the frame, which many manufacturers punch separately; ask for the original paperwork, the purchase invoice or the manual carrying the number; and if none of that turns up, consider an independent technical verification before committing. A machine without identification is harder to resell and harder to justify in an inspection.
This is one piece of something larger: the full guide on what to check before buying. If the plate year gave you pause, look at who is responsible for CE marking. With the weight in hand, work out the cost of transport. And if you would rather someone went to see it and ran it, we arrange the inspection.
This guide reflects common practice in the sector and does not replace technical, legal or regulatory advice on a specific machine. Every machine and every destination country has its own particularities.