| Brand | Walker and co |
| Sub | |
| Model | Challenge |
| Introduced | 1882 |
| Estimated price US$ | 5,200 |
| AKA | |
| Reference | |
| Type – see definition | Monorail |
| Format | |
| Country | UK |
| Transactions sampled | insufficient data |
The estimated value presented above is an average of insufficient data transactions recorded over the past years. This should be taken as guidance only, as a value of a specific camera can be over or under the value suggested here, and further depends on the seller and buyer eagerness.
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